Valve-drive device.



W. RICHARDSON. In.

VALVE DRIVE DEVICE. APPLICATION men MAY I. 1917.

Patented Feb. 5; 1918.

Uni "r VALVE-DRIVE :onvion.

manage.

Specification of Letters Patent.

Patented lEeb. 5,

Application filed May 1, 1917. Serial N 0. 165,676.

To all whom it may concern:

Be it known that 1, WILLIAM ItroHAnDson, Jr, a citizen of the United States, residing at Ensley, in the county of J efierson, State of Alabama, have invented a new and useful Improvement in Valve-Drive Devices, of which the following is a specification.

My invention relates to an improvement in. a valve drive device and particularly to providing a safety device to prevent breakage of the valve or any of the parts of the drive device by a foreign substance becom ing caught between the blades of the valve and valve seat. The device is designed particularly for driving the usual rotary valve of a coal washer jig.

By my invention the possibility of breakage is eliminated as the undue stresses caused by the presence of foreign matter between the blades of the valve and valve seat are taken care of.

The invention will be more readily understood in connection with the accompanying drawings.

Figure 1 is an end view of the safety mechanism;

Fig. 2 is a side view of the same;

Fig. 3 is a detailed perspective of the safety device as applied to the valve mechanism.

In the drawings a T-head bolt a serves as a retainer for a spring I) rested on a jaw c, said jaw being fastened to a rocker arm at by means of a bolt f. The said bolt carries a pawl 72. and is free to slide in the slotted holes 9 of the rocker arm. The guides e serve to keep the jaw parallel with the rocker arm. The rocker arm is oscillated by means of a rod m connected to some source of power not shown, whereby the pawl it engages the teeth of the ratchet wheel 2" on one end of the spindle j, causing the valve 72 on the opposite end of the spindle to rotate. When a foreign substance enters the valve the stress on the pawl and pin are transmitted to the spring which yie ds sufficiently to permit the rocker arm to oscillate; the valve remaining stationary until the foreign matter is removed. The rod m is connected to a sleeve n, mounted on a pivot pin which is arranged to slide in slots 0 in the rocker arm so as to increase or decrease the length of oscillation transmitted by the connectin rod m. This sleeve is clamped by a ban Wheel Z in any desired position of adjustment.

What I claim is z--- 1.. In a valve drive device, the combina tion of a pawl and ratchet, yielding means for applying the movement of one of said parts to the other, a movable pin on which said pawl is mounted and a rocker arm adapted to permit said pin to slide toward and away from said'ratchet.

2. In a valve drive, the combination of a pawl and ratchet, a movable pin on which said pawl is mounted, a rocker arm having a slotted engagement with said pin to per mit the said pin to slide toward or away from the ratchet, and a spring for pressing said pin toward ratchet wheel.

3. In a valve drive, the combination of a movable pawl, a ratchet, a pin on which said pawl is mounted, a rocker arm provided with slots to permit said pin to slide toward and away'from said ratchet, a spring for pressing said pin toward the ratchet wheel, a jaw upon which the same is rested, a bolt to retain said spring and guides for keeping the movement of the jaw parallel with the rocker arm.

In witness whereof, I have hereunto signed my name.

WILLIAM RICHARDSON, Jr.

fiopies of this patent may be obtained for five cents each, by addressing the tiommtssionerot Patenta,

asningtcn, 10.. W 

